Ratchet-bolt.



UNITED AsTaTns PATENT OFFICE.

RATCHET-BOLT.

Specification of Letters Patent.

Patented June 11, 190'?.

Application filed September 25, 1905 Serial No. 279.930.

To {if/ZZ wiz/fm2, t ntcty/ concern:

Be it known that I, LOUIS IIEFFNnn, ol" Minneapolis, Hennepin county, Minnesota, have invented certain new and use'lul Improvements in Ratchet-Bolts, ot which the l'ollowing is a specification.

The obj eet of Iny invention is to provide a bolt having means for permanentl f locking the nut thereon to prevent it from accidentally working loose and becoming separated -lrom the bolt. The bolt is adapted vfor use wherever it is desired to 'lorm a rigid permanent connection, and is designed particularly l'or use in railroad work, where the jar et passing trains has a tendency to loosen the nuts on the bolts which secure the rails together at the joints.

My invention consists generally in a bolt having a shank provided with a spirally arranged groove havingl a series ol ratchet teeth on one edge, and a nut having an interiorly arranged projection provided with teeth to engage the teeth on said shank.

In the accompanying drawings 'forming part of this specification, Figure l is a view partially in section o'l a bolt embodying my invention. 2 is a similar view with the bolt removed. YF ig. 3 is a sectional view oi the nut. Fig. 4 is an end view. II 5 is a sectional view on the line fcoi' Fig. 2, and Fig. 6 is a view oi the nut detached from the bolt.

In the drawing7 2 represents the bolt shank having a head 3 and provided in place ol' the usual threads at the end opposite l'rom the head with a spiral groove 4 extending inwardly from the end or' the bolt on the periphery of its shank and having on its outer edge a series of shallow ratchet teeth 5.

6 is a nut of the ordinary type having a projection 7 therein provided on one edge with teeth S corresponding to those on the bolt shank and adapted to engage the same and lock the nut on the bolt. The projection 7 is oi suitable width to lit the groove 4 and slide therein as the nut is turned and act as a guide for the nut on the shank and prevent the teeth 8 lrom becoming disengaged 'lrom the teeth 5.

In operation: The bolt having been placed in position the nut is turned thereon and the teeth on the projection 7 sliding over those on the shank will allow the nut to be tightened, and when so tightened the nut will be locked and backward movement ol' it on the shank will be impossible. I'lrhenever the bolt l ad or nut become worn and the bolt rendered loo'se in its socket, the mit can be easily turned to a new position and the bolt tightened.

I claim as my invention:

l. A bolt having a head at one end and a spirally arranged peripheral groove in its other end, a series ol' ratchet teeth provided.

in one edge oil said groove, and a nut having a' projection to lit into said groove and he guided thereby, and teeth to engage the teeth olf said groove, substantially as described.

A ratchet bolt comprising a shank having a head at one end and a spirally arranged peripheral groove in its other end provided with a series ol" ratchet teeth on' one edge, a nut having a socket to receive the end oisaid bolt, and a projection adapted to Vlit into said groove and slide therein and serve as a guide lor said nut, and said projection having a series of ratchet teeth on one edge to engage the teeth in said groove and lock said nut on said shank, substz'intially as described.

In witness wheIeol', I have hereunto set my hand this 19th day of September 1905.

LO UIS IIICFFN E lt.

I'Vit nesses RICHARD PAUL, O. MACNAMAIM. 

